Electric utilities in Montana
Every electric utility serving Montana in EIA data year 2025, with ownership type, grid operator, balancing authority, customers and the counties each one serves.
Retail electric utilities in Montana
Sorted by customers. See Montana on the map, and the state regulator, Montana Public Service Commission.
| Utility | EIA ID | Type | ISO or region | Balancing authority | Customers | Counties served |
|---|---|---|---|---|---|---|
| NorthWestern Energy LLC - (MT)NorthWestern Energy (MT) | 12825 | Investor-owned | West (no ISO) | NWMT | 372,271 | 35 Beaverhead, Big Horn, Blaine, Broadwater, Carbon, Cascade, Chouteau, Deer Lodge, Fergus, Gallatin, Golden Valley, Granite, Hill, Jefferson, Judith Basin, Lewis and Clark, Liberty, Madison, Meagher, Mineral, Missoula, Musselshell, Park, Phillips, Pondera, Powell, Ravalli, Rosebud, Sanders, Silver Bow, Stillwater, Sweet Grass, Teton, Valley, Wheatland |
| Flathead Electric Coop Inc | 6395 | Cooperative | West (no ISO) | BPAT | 66,911 | 6 Carbon, Flathead, Lake, Lincoln, Park, Sanders |
| Montana-Dakota Utilities CoMontana-Dakota Utilities (MDU) | 12199 | Investor-owned | SPP | SWPP | 25,673 | 11 Custer, Daniels, Dawson, Fallon, McCone, Prairie, Richland, Roosevelt, Rosebud, Sheridan, Wibaux |
| USBIA-Mission Valley Power | 19603 | Federal | West (no ISO) | NWMT | 21,462 | 4 Flathead, Lake, Missoula, Sanders |
| Yellowstone Valley Elec Co-op | 20997 | Cooperative | West (no ISO) | WAUW | 20,158 | 6 Big Horn, Carbon, Musselshell, Stillwater, Treasure, Yellowstone |
| Missoula Electric Coop, Inc | 12692 | Cooperative | West (no ISO) | BPAT | 15,027 | 6 Granite, Lake, Mineral, Missoula, Powell, Ravalli |
| Ravalli County Elec Coop, Inc | 26916 | Cooperative | West (no ISO) | NWMT | 10,552 | 2 Missoula, Ravalli |
| Vigilante Electric Coop, Inc | 23586 | Cooperative | West (no ISO) | NWMT | 10,025 | 9 Beaverhead, Broadwater, Deer Lodge, Gallatin, Jefferson, Lewis and Clark, Madison, Meagher, Silver Bow |
| Glacier Electric Coop, Inc | 7262 | Cooperative | West (no ISO) | NWMT | 7,728 | 4 Flathead, Glacier, Pondera, Toole |
| Fergus Electric Coop, Inc | 21513 | Cooperative | West (no ISO) | WAUW | 6,462 | 14 Blaine, Cascade, Chouteau, Fergus, Golden Valley, Judith Basin, Meagher, Musselshell, Petroleum, Stillwater, Sweet Grass, Treasure, Wheatland, Yellowstone |
| Park Electric Coop Inc | 14500 | Cooperative | West (no ISO) | NWMT | 6,064 | 4 Gallatin, Meagher, Park, Sweet Grass |
| Lincoln Electric Coop, Inc | 11022 | Cooperative | West (no ISO) | BPAT | 5,887 | 2 Flathead, Lincoln |
| Sun River Electric Coop, Inc | 18401 | Cooperative | West (no ISO) | WAUW | 5,876 | 8 Cascade, Chouteau, Judith Basin, Lewis and Clark, Liberty, Pondera, Teton, Toole |
| Beartooth Electric Coop, Inc | 1417 | Cooperative | West (no ISO) | NWMT | 5,729 | 3 Carbon, Stillwater, Sweet Grass |
| McCone Electric Coop Inc | 11989 | Cooperative | West (no ISO) | WAUW | 5,289 | 9 Custer, Dawson, Garfield, McCone, Petroleum, Prairie, Richland, Roosevelt, Rosebud |
| Lower Yellowstone R E A, Inc | 11272 | Cooperative | West (no ISO) | WAUW | 5,074 | 3 Dawson, Richland, Roosevelt |
| Tongue River Electric Coop Inc | 19022 | Cooperative | West (no ISO) | NWMT | 5,026 | 8 Big Horn, Carter, Custer, Dawson, Fallon, Powder River, Prairie, Rosebud |
| Northern Lights, Inc | 13758 | Cooperative | West (no ISO) | BPAT | 4,322 | 2 Lincoln, Sanders |
| Hill County Electric Coop, Inc | 8632 | Cooperative | West (no ISO) | NWMT | 3,869 | 5 Blaine, Chouteau, Fergus, Hill, Liberty |
| Marias River Electric Coop Inc | 11643 | Cooperative | West (no ISO) | NWMT | 3,828 | 3 Liberty, Pondera, Toole |
| Big Horn County Elec Coop, Inc | 1683 | Cooperative | West (no ISO) | NWMT | 3,633 | 1 Big Horn |
| Sheridan Electric Coop, Inc | 16759 | Cooperative | SPP | SWPP | 3,579 | 3 Daniels, Roosevelt, Sheridan |
| NorVal Electric Cooperative, Inc | 13749 | Cooperative | SPP | SWPP | 3,381 | 5 Daniels, McCone, Phillips, Roosevelt, Valley |
| Southeast Electric Coop, Inc | 17593 | Cooperative | West (no ISO) | WAUW | 2,080 | 4 Carter, Custer, Fallon, Powder River |
| Mid-Yellowstone Elec Coop, Inc | 12463 | Cooperative | West (no ISO) | WAUW | 2,026 | 5 Big Horn, Custer, Rosebud, Treasure, Yellowstone |
| Big Flat Electric Coop Inc | 1671 | Cooperative | West (no ISO) | NWMT | 1,991 | 3 Blaine, Phillips, Valley |
| Fall River Rural Elec Coop Inc | 6169 | Cooperative | West (no ISO) | BPAT | 1,964 | 1 Gallatin |
| City of Troy - (MT) | 19236 | Municipal | West (no ISO) | BPAT | 978 | 1 Lincoln |
| Goldenwest Electric Coop, Inc | 7318 | Cooperative | SPP | SWPP | 805 | 3 Dawson, Fallon, Wibaux |
| Powder River Energy Corp | 19156 | Cooperative | West (no ISO) | WACM | 178 | 2 Big Horn, Powder River |
| McKenzie Electric Coop Inc | 12087 | Cooperative | SPP | SWPP | 116 | 2 Richland, Wibaux |
| Big Horn Rural Electric Co | 1675 | Cooperative | West (no ISO) | WACM | 72 | 2 Big Horn, Carbon |
| Black Hills Power, Inc. d/b/aBlack Hills Energy (South Dakota/Wyoming) | 19545 | Investor-owned | West (no ISO) | WACM | 42 | 2 Carter, Powder River |
| Avista CorpAvista | 20169 | Investor-owned | West (no ISO) | AVA | 29 | 1 Sanders |
| WAPA-- Western Area Power Administration | 27000 | Federal | SPP | SWPP | 15 | 25 Big Horn, Blaine, Carbon, Cascade, Chouteau, Custer, Dawson, Fallon, Garfield, Hill, Lewis and Clark, Liberty, McCone, Phillips, Pondera, Prairie, Richland, Roosevelt, Rosebud, Teton, Toole, Treasure, Valley, Wibaux, Yellowstone |
| Grand Electric Coop, Inc | 7484 | Cooperative | SPP | SWPP | 14 | 1 Carter |
| Bonneville Power Administration | 1738 | Federal | West (no ISO) | — | — | 8 Broadwater, Deer Lodge, Granite, Jefferson, Mineral, Missoula, Powell, Silver Bow |
| Central Montana E Pwr Coop Inc | 40301 | Cooperative | West (no ISO) | — | — | 0 — |
| Upper Missouri G&T El Coop Inc | 19389 | Cooperative | SPP | — | — | 0 — |
Which utilities serve each county in Montana
Retail power marketers and other entities in Montana
Competitive suppliers, wholesale marketers, transmission-only companies and behind-the-meter providers that report to EIA for Montana. They have no county service territory of their own.
| Entity | EIA ID | Type | ISO or region | Customers |
|---|---|---|---|---|
| Talen Energy Marketing, LLC | 28802 | Retail power marketer | West (no ISO) | 12 |
| Tenaska Power Services | 18995 | Retail power marketer | West (no ISO) | 3 |
| Morgan Stanley Capital Grp Inc | 12917 | Retail power marketer | West (no ISO) | 2 |
About this data
Which utilities exist comes from the U.S. Energy Information Administration’s Form EIA-861 and EIA-861S, data year 2025 (final release, October 7, 2026), read directly from eia.gov. County service territories, balancing authority codes and customer counts come from EIA-861 for 2018, the latest year compiled at county level for this directory; utilities that started reporting after 2018 carry their 2025 values. County boundaries are U.S. Census cartographic boundaries (us-atlas 3.0, Albers USA projection).
Customer counts are per utility within Montana. A county’s grid operator is the one serving most of its customers, estimated by spreading each utility’s customers evenly over its counties. Download every state in one file from the U.S. Electric Utility Directory.
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